Development of Heterogeneous Thiol-Ene Polymer Beads and their Applications in Polymer-Supported Organocatalysis
Institution: | University of Oslo |
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Department: | |
Year: | 1000 |
Keywords: | VDP::440 |
Record ID: | 1283849 |
Full text PDF: | http://urn.nb.no/URN:NBN:no-29624 https://www.duo.uio.no/handle/10852/12733 https://www.duo.uio.no/bitstream/handle/10852/12733/2/MasterThesisKimAlexFredriksen.pdf |
Siden tusenårsskiftet har reaksjoner katalysert av ikke-metallholdige organiske molekyler (organokatalyse) økt i popularitet. Organokatalysatorer opererer under milde reaksjons betingelser og via flere aktiviseringsmoder. Organokatalyse har etter hvert opparbeidet seg et solid rykte innen asymmetrisk syntese. Samtidig har det var vanlig å forankre organokatalysatorer på polymere partikler. Disse muliggjør enkel separasjon av organokatalysatoren fra reaksjonsmediet samtidig som polymerene kan gjenbrukes. Det er dermed interessant å utvikle nye metoder for å syntetisere disse polymer-bundne organokatalysatorene. Arbeidet som fremgår i denne avhandlinger tar sikte på å utvikle en ny metode for å forankre organokatalysatorer til polymere partikler via en polymeriseringsteknikk som bruker koblingen mellom tioler og alkener. Since the year 2000 chemical transformations promoted by non-metallic organic catalysts (organocatalysts) have experienced an explosive interest. Operating via benign conditions and via many modes of activation, organocatalysis is considered to be a mature field within catalysis. The preparation of heterogeneous polymer-supported organocatalysts is of special interest since they allow easy separation of the catalyst from the reaction medium. The polymer-supported catalysts can also be recycled often keeping the same catalytic efficiency for many cycles. Inventing new methods to prepare polymer-supports and by extension polymer-supported organocatalysts are thus of interest in organocatalysis. The work presented in this thesis aim to prepare these heterogeneous polymer-supported organocatalysts by taking advantage of a free radical thiol-ene coupling reaction polymerisation developed in our group. Several polymer-supported organocatalysts were synthesised via this method.